package com.sky.service.impl;


import com.baomidou.mybatisplus.core.conditions.query.LambdaQueryWrapper;
import com.baomidou.mybatisplus.extension.service.impl.ServiceImpl;
import com.baomidou.mybatisplus.extension.toolkit.Db;
import com.sky.context.BaseContext;
import com.sky.dto.ShoppingCartDTO;
import com.sky.entity.Dish;
import com.sky.entity.Setmeal;
import com.sky.entity.ShoppingCart;
import com.sky.mapper.DishMapper;
import com.sky.mapper.SetmealMapper;
import com.sky.mapper.ShoppingCartMapper;
import com.sky.service.ShoppingCartService;
import org.springframework.beans.BeanUtils;
import org.springframework.beans.factory.annotation.Autowired;
import org.springframework.stereotype.Service;

import java.time.LocalDateTime;
import java.util.List;

@Service
public class ShoppingCartServiceImpl extends ServiceImpl<ShoppingCartMapper, ShoppingCart>
        implements ShoppingCartService {
    @Autowired
    private ShoppingCartMapper shoppingCartMapper;
    @Autowired
    private DishMapper dishMapper;
    @Autowired
    private SetmealMapper setmealMapper;

    /**
     * 添加购物车
     *
     * @param shoppingCartDTO
     */
    public void addShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //判断当前商品是否在购物车中
        LambdaQueryWrapper<ShoppingCart> qw = new LambdaQueryWrapper<>();
        qw.eq(shoppingCart.getUserId() != null, ShoppingCart::getUserId, shoppingCart.getUserId())
                .eq(shoppingCart.getDishId() != null, ShoppingCart::getDishId, shoppingCart.getDishId())
                .eq(shoppingCart.getSetmealId() != null, ShoppingCart::getSetmealId, shoppingCart.getSetmealId())
                .eq(shoppingCart.getDishFlavor() != null, ShoppingCart::getDishFlavor, shoppingCart.getDishFlavor())
                .orderByDesc(ShoppingCart::getCreateTime);

        List<ShoppingCart> shoppingCartList = shoppingCartMapper.selectList(qw);

        if (shoppingCartList != null && shoppingCartList.size() == 1) {
            //如果已经存在，就更新数量，数量加1
            shoppingCart = shoppingCartList.get(0);
            shoppingCart.setNumber(shoppingCart.getNumber() + 1);
            shoppingCartMapper.updateById(shoppingCart);
        } else {
            //如果不存在，插入数据，数量就是1

            //判断当前添加到购物车的是菜品还是套餐
            Long dishId = shoppingCartDTO.getDishId();
            if (dishId != null) {
                //添加到购物车的是菜品
                Dish dish = Db.getById(dishId, Dish.class);
                shoppingCart.setName(dish.getName());
                shoppingCart.setImage(dish.getImage());
                shoppingCart.setAmount(dish.getPrice());
            } else {
                //添加到购物车的是套餐
                Setmeal setmeal = Db.getById(shoppingCartDTO.getSetmealId(), Setmeal.class);
                shoppingCart.setName(setmeal.getName());
                shoppingCart.setImage(setmeal.getImage());
                shoppingCart.setAmount(setmeal.getPrice());
            }
            shoppingCart.setNumber(1);
            shoppingCart.setCreateTime(LocalDateTime.now());
            shoppingCartMapper.insert(shoppingCart);
        }
    }

    /**
     * 查看购物车
     *
     * @return
     */
    public List<ShoppingCart> showShoppingCart() {
        ShoppingCart shoppingCart = ShoppingCart.builder()
                .userId(BaseContext.getCurrentId())
                .build();

        LambdaQueryWrapper<ShoppingCart> qw = new LambdaQueryWrapper<>();
        qw.eq(shoppingCart.getUserId() != null, ShoppingCart::getUserId, shoppingCart.getUserId())
                .orderByDesc(ShoppingCart::getCreateTime);

        List<ShoppingCart> shoppingCartList = shoppingCartMapper.selectList(qw);
        return shoppingCartList;
    }

    /**
     * 清空购物车商品
     */
    public void cleanShoppingCart() {
        LambdaQueryWrapper<ShoppingCart> qw = new LambdaQueryWrapper<>();
        qw.eq(ShoppingCart::getUserId, BaseContext.getCurrentId())
                .orderByDesc(ShoppingCart::getCreateTime);
        shoppingCartMapper.delete(qw);
    }

    @Override
    public void subShoppingCart(ShoppingCartDTO shoppingCartDTO) {
        ShoppingCart shoppingCart = new ShoppingCart();
        BeanUtils.copyProperties(shoppingCartDTO, shoppingCart);
        //只能查询自己的购物车数据
        shoppingCart.setUserId(BaseContext.getCurrentId());

        //判断当前商品是否在购物车中
        LambdaQueryWrapper<ShoppingCart> qw = new LambdaQueryWrapper<>();
        qw.eq(shoppingCart.getUserId() != null, ShoppingCart::getUserId, shoppingCart.getUserId())
                .eq(shoppingCart.getDishId() != null, ShoppingCart::getDishId, shoppingCart.getDishId())
                .eq(shoppingCart.getSetmealId() != null, ShoppingCart::getSetmealId, shoppingCart.getSetmealId())
                .eq(shoppingCart.getDishFlavor() != null, ShoppingCart::getDishFlavor, shoppingCart.getDishFlavor())
                .orderByDesc(ShoppingCart::getCreateTime);

        List<ShoppingCart> shoppingCartList = shoppingCartMapper.selectList(qw);

        if (shoppingCartList != null && shoppingCartList.size() == 1) {
            //如果已经存在，就更新数量
            shoppingCart = shoppingCartList.get(0);
            if (shoppingCart.getNumber() > 1) {
                shoppingCart.setNumber(shoppingCart.getNumber() - 1);
                shoppingCartMapper.updateById(shoppingCart);
            } else {
                cleanShoppingCart();
            }
        }
    }
}